linux-kernel - [PATCH part3 2/5] x86, acpi: Split acpi_table

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Date:	Thu, 8 Aug 2013 16:54:03 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	riel@...hat.com, jweiner@...hat.com, prarit@...hat.com,
	zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com
Cc:	x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH part3 2/5] x86, acpi: Split acpi_table_init() into two parts.

This patch splits acpi_table_init() into two steps.

Since acpi_table_init() is used not just in x86, also used in ia64,
we introduce two new functions:
    acpi_table_init_firmware() and acpi_table_init_override(),
which work just the same as acpi_table_init() if they are called
in sequence. This will keep acpi_table_init() works as before on
other platforms, and we only call these new functions in Linux.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 drivers/acpi/tables.c |   26 ++++++++++++++++++++------
 include/linux/acpi.h  |    2 ++
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index c8f2d01..4913a85 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -336,6 +336,23 @@ static void __init check_multiple_madt(void)
 	return;
 }
 
+int __init acpi_table_init_firmware(void)
+{
+	acpi_status status;
+
+	status = acpi_initialize_tables_firmware(initial_tables,
+						 ACPI_MAX_TABLES, 0);
+	if (ACPI_FAILURE(status))
+		return 1;
+
+	return 0;
+}
+
+void __init acpi_table_init_override(void)
+{
+	acpi_initialize_tables_override();
+}
+
 /*
  * acpi_table_init()
  *
@@ -347,16 +364,13 @@ static void __init check_multiple_madt(void)
 
 int __init acpi_table_init(void)
 {
-	acpi_status status;
-
-	status = acpi_initialize_tables_firmware(initial_tables,
-						 ACPI_MAX_TABLES, 0);
-	if (ACPI_FAILURE(status))
+	if (acpi_table_init_firmware())
 		return 1;
 
-	acpi_initialize_tables_override();
+	acpi_table_init_override();
 
 	check_multiple_madt();
+
 	return 0;
 }
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 353ba25..9704179 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -95,6 +95,8 @@ void acpi_boot_table_init (void);
 int acpi_mps_check (void);
 int acpi_numa_init (void);
 
+int acpi_table_init_firmware(void);
+void acpi_table_init_override(void);
 int acpi_table_init (void);
 int acpi_table_parse(char *id, acpi_tbl_table_handler handler);
 int __init acpi_table_parse_entries(char *id, unsigned long table_size,
-- 
1.7.1

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